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@katai5plate
katai5plate / rar.md
Last active April 17, 2020 01:38
react-app-rewired 動作原理メモ

codes

index

  • paths に加え scriptVersion, configOverrides, customScriptsIndex を返す
1. index.js
  2. scripts/utils/path.js
    3. <prj>/package.json から config-overrides-path を取得
    4. <react-scripts>/config/paths.js から paths を取得

start

@potato2003
potato2003 / setusergroups
Last active March 27, 2019 08:36
ruby 環境で必要だったので、kazuho さんの https://gist.github.com/kazuho/6181648 を参考に書いた。(参考リンク - 2) http://d.hatena.ne.jp/hirose31/20130808/1375965331
#!/usr/bin/env ruby
# usage: setusergroups [-h|--help] username child
#
# setuidgid w. support for supplementary groups
# ruby porting of https://gist.github.com/kazuho/6181648
#
# see: http://d.hatena.ne.jp/hirose31/20130808/1375965331
# see: https://gist.github.com/kazuho/6181648
@voluntas
voluntas / understanding_webrtc_internals.rst
Last active May 21, 2024 13:55
詳解 WebRTC

詳解 WebRTC

更新:2017-09-26
作者:@voluntas
作者サイト:http://voluntas.github.io/
バージョン:1.2.1
セッション日時:2017-09-24 14:20 - 15:00
セッション場所:5号館3F
@fand
fand / codebase_overview.md
Last active December 12, 2016 03:17
ReactのCodebase Overview, Implementation Notes要約

Codebase Overview

https://facebook.github.io/react/contributing/codebase-overview.html

Custom Module System

  • FacebookではHasteというモジュールシステムを使っている
    • all filenames are globally unique
    • require('../foo/bar') の代わりに require('bar') とする
    • ファイル移動しても壊れない
    • Fuzzy Finder使いやすい
  • ビルド時に、全てのファイルを /lib 下にフラットに配置する
@garybernhardt
garybernhardt / types.markdown
Last active May 22, 2024 10:02

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

@yuroyoro
yuroyoro / Uber-migrated-pg-to-mysql.md
Created July 27, 2016 06:28
UberのPostgresqlからNoSQL on MySQLへの移行を読んでざっくりまとめた

Why Uber Engineering Switched from Postgres to MySQL - Uber Engineering Blog のまとめ

Posgresqlだと

  • pgは追記型なので少しの更新でも多くのdiskへのwriteがおきる
  • カラムを一つ更新しただけで多くのindexの書き換えが起こる
  • よって、replicationはWALを送るので更新が多いとWALが大量に送られる
  • repcliationでは物理的なdiskの変更を送る
  • DC間でレプリするときつい
  • bugがあってreplica間でMVCCの不整合が起きる
@richhollis
richhollis / add_user_name_to_users.rb
Last active May 9, 2020 07:26
Rails 4.2.5.1 and Devise 3.5.6 using attr_encrypted with email attribute encrypted and username clear text
class AddUserNameForAuthenticationToUsers < ActiveRecord::Migration
def up
add_column :users, :username, :string, null: false, default: ""
add_index :users, :username, unique: true
add_column :users, :encrypted_email, :string
remove_column :users, :email, :string
add_index :users, :encrypted_email
end
def down
remove_column :users, :username
@voluntas
voluntas / realtime_movie_stream.rst
Last active May 18, 2023 04:25
リアルタイム動画配信コトハジメ
@azu
azu / flux-utils.md
Last active August 8, 2018 17:31
flux-utilsについて
@jackghm
jackghm / HP-Vertica-Date-Time.sql
Created August 2, 2015 22:54
Working with HP-Vertica date and time
/*
#1 always write datetime values into the database as UTC!!!
-- Reread that last statement
Vertica will store all datetime values as UTC values
*/
-- I highly recommend storing an Integer column of the Day Date
select TO_CHAR(<% DATA_END_TIME %>::DATE - INTEGER '1', 'YYYYMMDD')::INTEGER AS date_id
SELECT CLOCK_TIMESTAMP() "Current Time"; -- return current time
SELECT NOW(); -- time since last session connection (or commit;) which may be an older time than now